Malicious PDF — malware analysis report

Static analysis result for SHA-256 7faa0f29f3ba9b29…

MALICIOUS

PDF

88.6 KB Created: 2021-09-15 09:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4eacd9d20138f2be301b0a857973ec9d SHA-1: 133a31e2ec774e46316440f8cd4a1b272bc88da9 SHA-256: 7faa0f29f3ba9b2992add4639bf525fdee7bb86a4e62e6492d3af8b12947b52f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically flags links to compromised WordPress uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://archism.ru/uplcv?utm_term=root+realme+rmx2189 PDF link annotation
    • https://agmatbaa.com/upload/files/sitonumisimobufajeba.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210907085638231.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/4324069803.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/36480527532.pdfIn PDF document text
    • http://isgsrl.it/images/file/pavaxuwunidumed.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/30456991715.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/vafikotoruxeduvi.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/ponibobuxise.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8397k71c0fseospalrkg21uo31/18684086176.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/regevividotubazif.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/dujib.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/kaxogawememewasas.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/riwitu.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/mbatfthclaf8emcv023c6uhtub/penululijizutizud.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/davosoledatiju.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/timutedika.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161321942b52ae---49425774298.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/rosusenido.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/36711375435.pdfIn PDF document text
    • http://belv.ru/userfiles/file/durav.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/45207615869.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/41e1f3a929bd358a89c80a009b8155dc/fuferumenix.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/musajuwurevutipibitape.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/63676126019.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44D 18448 bytes
SHA-256: 6bd02d3e585ed82b29994b59386347f846f570d2217b70ae32578536076c2d7d
font_01_sfnt_off000124a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBB 10600 bytes
SHA-256: f68a103381e26ff530fe0483d5a6c81ce6fdb76c10ad8dad480fc2e85b800ad7

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